Browsing by Author "Pecchi, Gina"

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    Conversion of Levulinic Acid over Ru/SrZrO 3 and Ru/BaZrO 3 Supported Basic Catalysts
    (2023) Leal Villarroel, Edgardo; Seguel, Juan; Rodríguez, Pedro; Blanco, Elodie; Escalona, Néstor; Pecchi, Gina; Sepúlveda, Catherine
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    Fischer-Tropsch synthesis over LaFe1-xCoxO3 perovskites from a simulated biosyngas feed
    (2010) Escalona, Néstor; Fuentealba, Soledad; Pecchi, Gina
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    Furfural adsorption on V2O5 surface: A combined experimental-theoretical study
    (2024) Lizana, Ignacio; Schott, Eduardo; Saavedra-Torres, Mario; Hidalgo-Rosa, Yoan; Pecchi, Gina; Karelovic, Alejandro; Zarate, Ximena
    The adsorption of furfural on the V 2 O 5 surface was investigated using experimental and theoretical methods. In situ Diffuse Reflectance Infrared Fourier-Transform Spectroscopy results show the presence of physi- and chemisorption phenomena, where trans -furfural is mostly chemisorbed at the beginning of the adsorption process. These results are in agreement with theoretical DFT results, as the most thermodynamically favored configurations corresponds to the chemisorbed trans -furfural (T1) and cis -furfural (C1) with binding energies of -1.83 and -2.05 eV.
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    Magnetic Fe3O4@SiO2-Pt and Fe3O4@SiO2-Pt@SiO2 Structures for HDN of Indole
    (2019) Dinamarca, Robinson; Valles, Veronica; Ledesma, Brenda; Campos, Cristian H.; Pecchi, Gina; Beltramone, Andrea
    The effect of a second porous SiO2 shell in the activity and selectivity of the Fe3O4@SiO2-Pt catalyst in the hydrodenitrogenation of indole is reported. The double Fe3O4@SiO2-Pt@SiO2 structure was prepared by coating Fe3O4 nanoparticles with tetraethyl orthosilicate (TEOS) with a further impregnation of 1.0 wt.% of Pt on the (3-aminopropyl)triethoxysilane functionalized Fe3O4@SiO2 structures. The second porous SiO2 shell, obtained by using a hexadecyltrimethylammonium bromide (CTAB) template, covered the Fe3O4@SiO2-Pt catalyst with a well-defined and narrow pore-sized distribution. The full characterization by TEM, inductively coupled plasma-optical emission spectroscopy (ICP-OES), XRD, and N-2 adsorption isotherm at 77 K and vibrating sample magnetometry (VSM) of the catalysts indicates homogeneous core@shell structures with a controlled nano-size of metallic Pt. A significant effect of the double SiO2 shell in the catalytic performance was demonstrated by both a higher activity to eliminate the nitrogen atom of the indole molecule present in model liquid fuel and the improvement of the catalytic stability reaching four consecutive reaction cycles with only a slight conversion level decrease.
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    Reduced alkaline earth metal (Ca, Sr) substituted LaCoO3 catalysts for succinic acid conversion
    (2022) Rojas, Mabel; Bernales, Gabriel; Dongil, Ana Belen; Pecchi, Gina; Escalona, Nestor
    The effect of partial substitution of La by Ca and Sr in the catalytic activity of lanthanum cobaltite (LaCoO3) was studied. Two series of La1-xCaxCoO3 and La1-xSrxCoO3 (x = 0, 0.2, and 0.4) reduced perovskites were prepared, characterized and evaluated in the succinic acid conversion at 200 degrees C and 6 MPa. The characterization results showed a larger Ca substitution in the La1-xCaxCoO3 series, whereas carbonates as segregated phases up to x = 0.2 of Sr were obtained in the La1-xSrxCoO3 series. In the Sr substituted perovskites, the oxidation of Co3+ to Co4+ neutralizes the electronic instability, whereas in the Ca substituted perovskites the presence of Ca2+ generates oxygen vacancies. The succinic acid conversion forms mainly succinic anhydride and 2-hydroxy-tetrahydrofuran by dehydration and hydrogenation processes. The highest initial rate of the reduced LaCoO3 was attributed to the smallest Co crystal size with no segregated phases, compared to substituted catalysts.